Study on Mechanical and Ecological Properties of Fly Ash Substrate for Ecological Slope Protection

Wan, Juan; Zhu, Jun; Xiao, Henglin; Ma, Qiang

doi:10.1155/2019/8095219

Cited by 9 publications

(5 citation statements)

References 26 publications

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“…Active chemicals such as Si, Al, and Ca in y ash are known to react with water in concrete, and this increases with increasing y ash content, enhancing the shear strength of the base material. However, excess y ash (exceeding 50 g) can prevent reaction with water and thus inhibit the development of shear strength [21]. As plotted in FIGURE 6, the cohesion results are similar to those for the shear strength; the CBS: soil ratio and y ash contents have signi cant positive effects on cohesion (P < 0.05).…”

Section: Substrate Mechanical Propertiesmentioning

confidence: 52%

“…The nutrient contents of the substrate, namely, the organic matter, total N, total K, total P, and total Na contents, were determined using an XRF spectrometer. The variables R CN , R CP , and R NP were respectively used in this study to represent the ratios of C to N, C to soil P, and N to soil P. The contents of heavy metals (Pb, Cd, Cu, Zn, Hg, and Ni) were determined by plasma emission spectroscopy [21]. Each test was performed using at least ve samples, the maximum and minimum values were removed, and the average of the middle three values was taken.…”

Section: Substrate Nutrient Contentsmentioning

confidence: 99%

“…Different improvement materials have distinct functions. For example, y ash can reduce soil acidity and improve soil strength, enzyme activity, and the organic C content of the soil [21,22]; maize straw can activate enzyme activity and increase the organic C content of the soil [23,24]; and expanded polystyrene (EPS) is lightweight and can effectively retain heat [14,25]. These three materials are all either industrially or agriculturally produced waste materials and thus are inexpensive and readily available.…”

Section: Introductionmentioning

confidence: 99%

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Functionality Optimizing Study On Coal-bearing Soil Ecological Substrates

Huang

Zheng

2022

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Ecological restoration is of profound significance for protecting the ecology and engineering safety of coal-bearing soil (CBS) areas. However, the formulations of CBS ecological substrates have rarely been explored. The objective of this study was therefore to evaluate the effects of the CBS:soil ratio (1000:0 g, 750:250 g, 500:500 g, 250:750 g), fly ash content (0, 50 g·kg− 1, 100 g·kg− 1, 150 g·kg− 1), maize straw content (0, 20 g·kg− 1, 40 g·kg− 1, 60 g·kg− 1), and expanded polystyrene (EPS) content (0, 3 g·kg− 1,6 g·kg− 1, 9 g·kg− 1) in an orthogonal design to optimize an ecological substrate according to various physicochemical, nutrient content, mechanical, and vegetation parameters. The results indicated that the CBS:soil ratio had significant effects on the nutrient content and vegetation growth parameters; fly ash dramatically improved the mechanical parameters (shear strength, cohesion, and internal friction angle); maize straw significantly affected the physical parameters and improved the substrate nutrient content; and EPS was the most beneficial to the vegetation germination ratio. A CBS:soil ratio of 1:1 (500:500 g), fly ash content of 100 g·kg− 1, maize straw content of 50 g·kg− 1, and EPS content of 6 g·kg− 1 were determined to produce the optimal mix for the ecological restoration of CBS. The conclusions of this research provide theoretical and practical guidance for the ecological restoration and stabilization protection of CBS slopes.

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Section: Substrate Mechanical Propertiesmentioning

confidence: 52%

Section: Substrate Nutrient Contentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Functionality Optimizing Study On Coal-bearing Soil Ecological Substrates

Huang

Zheng

2022

Preprint

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“…Natural disasters such as landslides and debris flows caused by slope instability are among the most frequent and harmful to human activities considering all kinds of geological disasters [1]. Rainfall is an important factor influencing slope instability [2], and slope ecological protection is a common form of slope protection [3,4], which is widely used in various projects such as highways, railroads and water conservancy [5,6]; however, the relationship between rainfall infiltration and ecological slope instability is still poorly understood. Therefore, it is important to study the rainfall infiltration and runoff rules of ecological slopes and determine the quantitative analysis model for ecological slope design.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Influence of Substrate Properties on Rainfall Infiltration and Runoff from Ecological Slopes

et al. 2023

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Rain is an important factor influencing the instability of ecological slopes. There is little research on the inherent quantitative influence of substrate properties on slope runoff and water infiltration to support accurate ecological slope protection design. In this paper, the influence of substrate characteristics on slope runoff and water infiltration is quantitatively analyzed by constructing large physical models with different substrate characteristics for artificial rainfall simulations. The experimental results showed that the cumulative runoff volume and slope runoff rate were positively correlated with the cement content and substrate thickness in a 4 h, 60 mm/h artificially simulated rainfall. Specifically, the cumulative runoff volume increased by 2.06% for every 1% increase in cement content, and the cumulative runoff volume increased by 3.93% for every 1 cm increase in substrate thickness. The substrate inhibited the advance of the wetting front, and at different slope locations, the transport rate of the wetting front exhibited a mid-slope > upslope. Moreover, the transport rate of the wetting front showed a non-linear relationship with time as a power function V = a·tb, with the cement content showing a linear relationship with parameters a and b, and the substrate thickness showing a non-linear relationship with parameters a and b. The cumulative infiltration and infiltration rate were negatively correlated with cement content and substrate thickness, as shown by a 2.2% decrease in cumulative infiltration for every 1% increase in cement content and a 4.73% decrease in cumulative infiltration for every 1 cm increase in substrate thickness.

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“…In this paper, natural and saturated soil samples with an area of S = 30 cm 2 and a height of H = 2 cm were prepared in the laboratory by taking the low liquid limit clay in the immersion zone with a ring knife and the mechanical properties of compression and consolidation were tested [31][32][33]. The influence of saturation on the strength and deformation index of low liquid limit clay was analyzed.…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Water Table on the Bearing Capacity of a Shallow Foundation

2022

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Immersion is an important part of reservoir engineering investigation and evaluation. Determining the reasonable and effective burial depth of the critical immersion water table is one of the key scientific issues in the impact assessment of the bearing capacity of reservoir immersion foundations. In this study, basic physical and mechanical property tests were carried out on the soil in the typical immersion area of Xiaonanhai Hydropower Station, and the influence mechanism of saturation on the mechanical properties of building foundation soil and immersion on the bearing capacity of a shallow foundation was obtained. According to the test results, the influence depth of the rising groundwater level on the stability of the building foundation is analyzed, and a method to determine the critical depth of immersion groundwater in the reservoir is proposed. Taking the typical building foundation of Luohuang Town in the immersion area of Xiaonanhai Reservoir as an example, the validity of the critical water depth is further verified. The results show that the safety limit depth of the independent foundation affected by the rise of the water table increases with the increase of the width of the foundation and decreases with the increase of the buried depth of the foundation. Considering the safety limit depth, the critical depth of building immersion is 4.830 m, and without considering the safety limit depth, the critical depth of building immersion is 4.05 m. To a certain extent, it can reduce the impact of water table changes on the bearing capacity of shallow foundations.

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Study on Mechanical and Ecological Properties of Fly Ash Substrate for Ecological Slope Protection

Cited by 9 publications

References 26 publications

Functionality Optimizing Study On Coal-bearing Soil Ecological Substrates

Functionality Optimizing Study On Coal-bearing Soil Ecological Substrates

Experimental Study on the Influence of Substrate Properties on Rainfall Infiltration and Runoff from Ecological Slopes

The Effect of the Water Table on the Bearing Capacity of a Shallow Foundation

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